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-15- <br />sixth, eighth,; or sixteenth bonds, with short nipples where <br />screw joints are used. <br />Increase or reduction in size shall be made by the use <br />of a proper fitting. <br />Section XLVIII. No double hub, or doubt T, shall be <br />used on horizontal runs, nor shall sanitary T branches be <br />used to change the direction of flow in or to horizontal <br />runs, nor shall double hubs or straight crosses be used on <br />the soil or waste pipe, saddle hubs and bands are in all <br />cases prohibited. <br />Section XLIX. Offset in the mains of all stacks shall <br />be avoided if possible, but when unavoidable they shall be <br />made with forty -five (45) degrees fittings. <br />Section L. All excavations required to be made for the <br />installation of a building drainage system, or any part <br />thereof, within the walls of a building, shall be open trench <br />work. All such trenches shall be kept open until the piping <br />has been inspected. <br />Section LI. All free standing stacks shall be thoroughly <br />supported on concrete or masonry piers at their base, and those <br />forty (40) feet or morein height shall also be provided with <br />foot rests at their base and also with floor rests or supports <br />at every ten (10) feet intervals. <br />The pipe supports according to their location shall be <br />made with either heavy iron posts, hangers, wall brackets or <br />steel fittings concrete or masonry piers; provided that no <br />brick pier shall be less than eight (8) inches square. The <br />use of pipe hooks shall be prohibited for larger than one <br />and one -half (12) inch pipe. <br />No elbow or quarter (4) bend shall be used on any soil <br />stack or waste line when the change in direction of flow is <br />from vertical to horizontal. <br />Section LII. When computing the size of house drains, <br />